CVE-2020-1757

A flaw was found in all undertow-2.x.x SP1 versions prior to undertow-2.0.30.SP1, all undertow-1.x.x and undertow-2.x.x versions prior to undertow-2.1.0.Final, where the Servlet container causes servletPath to normalize incorrectly by truncating the path after semicolon which may lead to an application mapping resulting in the security bypass.

Published: 2020-04-21 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-1757 is rated Moderate Risk (58.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.57%). EPSS rose +1.11% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-1757

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.46% 1.57% +1.11%
2 2025-11-21 0.27% 0.46% +0.20%
3 2025-11-18 — 0.27% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-1757

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 5.2 [email protected]
8.1 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 5.2 [email protected]
5.5 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 4.9 [email protected]

Weakness enumeration for CVE-2020-1757

GitHub Security Advisory for CVE-2020-1757

GHSA-2w73-fqqj-c92p · Severity: high · Ecosystem: maven — Improper Input Validation in Undertow

OS Trackers for CVE-2020-1757

vendor priority summary link
debian not yet assigned CVE-2020-1757 not yet assigned priority: Debian including 1 source packages (undertow), 2 status rows across 2 suites (forky, sid): resolved 2. https://security-tracker.debian.org/tracker/CVE-2020-1757
redhat high — https://access.redhat.com/security/cve/CVE-2020-1757
ubuntu medium CVE-2020-1757 medium priority: Ubuntu including 1 source packages (undertow), 17 status rows across 17 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 7, needs-triage 7, DNE 3. https://ubuntu.com/security/CVE-2020-1757

Affected software / configurations for CVE-2020-1757

Vendor Product Version Raw CPE
redhat undertow < 2.1.0 cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:*
redhat undertow 2.0.0 cpe:2.3:a:redhat:undertow:2.0.0:sp1:*:*:*:*:*:*
redhat undertow 2.0.25 cpe:2.3:a:redhat:undertow:2.0.25:sp1:*:*:*:*:*:*
redhat undertow 2.0.26 cpe:2.3:a:redhat:undertow:2.0.26:sp3:*:*:*:*:*:*
redhat undertow 2.0.28 cpe:2.3:a:redhat:undertow:2.0.28:sp1:*:*:*:*:*:*
redhat undertow 2.0.28 cpe:2.3:a:redhat:undertow:2.0.28:sp2:*:*:*:*:*:*
redhat jboss_data_grid 7.0.0 cpe:2.3:a:redhat:jboss_data_grid:7.0.0:*:*:*:*:*:*:*
redhat jboss_enterprise_application_platform 7.0.0 cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
redhat jboss_fuse 6.0.0 cpe:2.3:a:redhat:jboss_fuse:6.0.0:*:*:*:*:*:*:*
redhat jboss_fuse 7.0.0 cpe:2.3:a:redhat:jboss_fuse:7.0.0:*:*:*:*:*:*:*
redhat openshift_application_runtimes — cpe:2.3:a:redhat:openshift_application_runtimes:-:*:*:*:*:*:*:*
redhat single_sign-on 7.0 cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*

References for CVE-2020-1757

URL Tags
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1757 Issue Tracking Vendor Advisory
cvelogic Threat Intelligence